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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 20 Configuring T1/E1 Controllers
Troubleshooting Controllers
Troubleshooting T1 Controllers
To troubleshoot the T1 line card, complete the following steps in the controller configuration mode:
Command Purpose
Step 1
enable
Example:
Router# enable
Enables privileged EXEC mode. Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
controller e1
slot/subslot
Example:
Router(config-controller)#
controller e1 0/0
Sets the controller type. The command has the following syntax:
• slot—Slot number of the interface.
• subslot—0.
Step 4
loopback {local | network {line|
payload}}
Example:
Router(config-controller)# loopback
network line
Sends the packets from a port in local loopback to the remote end.
• local—Configures the line card to loop the transmitted traffic back to
the line card as E1 received traffic and transmits AIS to the remote
receiver.
• network line—Configures the E1 line card to loop the received traffic
back to the remote device after passing them through the line
loopback mode of the framer. The framer does not re-clock or reframe
the incoming traffic.
• network payload—Configures the E1 line card to loop the received
traffic back to the remote device after passing them through the
payload loopback mode of the framer. The framer re-clocks and
reframes the incoming traffic before sending it to the network.
Step 5
exit
Example:
Router(config-controller)# exit
Exits controller configuration mode.
Command Purpose
Step 1
enable
Example:
Router# enable
Enables privileged EXEC mode. Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.